Structures obtained from resolidification of flame-melted single-crystal germanium
- 1 April 1994
- journal article
- Published by IOP Publishing in Nanotechnology
- Vol. 5 (2), 101-112
- https://doi.org/10.1088/0957-4484/5/2/006
Abstract
When single-crystal germanium is partially melted with a gas flame in air, resolidification produces novel structures which may be useful for nanoscale fabrication. These features are dominated by a single, sharp cone, up to 5 mm long with a typical aspect ratio of 1.6. If impurity concentrations are sufficiently high, one or more micron-sized, impurity-rich spheres are formed at the tip of the cone. The surface displays a distinctive morphology which depends strongly on the chemical environment. After slow resolidification in air, the cone body and spheres are coated with fractal-like aggregates of spherical oxide particles. More rapid resolidification in laser-melted Ge can produce sharp (100 nm radius of curvature), clean cones. The observed features are attributed to dynamic resolidification, impurity segregation, and diffusion-limited aggregation processes.Keywords
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